Extraordinary photographs show life in the last days of the Calais 'Jungle' refugee camp at the end of October, alongside the current scene as it stands today.

An investigative team visited the area and saw first-hand how the doors can be opened in as little as 20 seconds.

A migrant in a camp in woodland near where the wall ends, at a roundabout next to Rue Yervant Toumaniantz, said it was “easy” to beat security.

He boasted: “They can’t stop us getting on to the lorries. We will always find a way to get to England.”

A source said the wall had been designed with access points to allow border officials to intercept migrants as they attempted to sneak into the UK. But an aid worker said the unlocked doors had rendered the whole thing “totally pointless”.

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The wall is 13ft high and was built using £2.3million of UK taxpayers’ money

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The barrier runs for well over half a mile beside the N216 motorway

The worker said: “It cost a fortune and does nothing. They should have spent money rehousing people and giving them the support they need.”

The Home Office said: “Security for the wall is a responsibility for the French authorities.

“We continue to work with our French counterparts to maintain border security and keep legitimate passengers and trade moving.

“Last year Border Force disrupted over 56,000 illegal attempts to enter the UK. Officers use some of the most advanced detection technology around.”